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FINANCIAL INSTRUMENTS (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 13, 2017 | Oct. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Mar. 07, 2017
Fair Value Measurements |  |  |  |  |  |  |
Price per share (in dollars per share) |  |  |  | $ 43.02 |  |  |
Debt Instrument, Convertible, Conversion Premium, Shares |  |  |  | 10,000 |  |  |
Estimated conversion value |  |  |  | $ 200 |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | $ 15,000 |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  |  |  |  | $ 10,000 |
Equity investment |  |  |  | 14,146 | $ 14,146 |  |
Investments, Contingent Purchase Obligation |  |  |  | 900 |  |  |
Level 2 |  |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |  |
Cost |  |  |  | 277,079 | 317,722 |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  |  |  | 5 | 0 |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  |  | (285) | (454) |  |
Available-for-sale Securities |  |  |  | $ 276,799 | 317,268 |  |
Convertible Senior Notes Due 2022 [Member] |  |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |  |
Price per share (in dollars per share) |  |  |  |  |  |  | $ 48.65
Initial conversion price of notes into common stock (in dollars per share) |  | $ 66.89 |  |  |  |  |
Notes |  |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |  |
Initial conversion price of notes into common stock (in dollars per share) |  |  |  | $ 24.82 |  |  |
Maximum |  |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Premium, Shares |  |  |  | 10,000 |  |  |
Maximum | Convertible Senior Notes Due 2022 [Member] |  |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Premium, Shares |  | 5,200,000 |  |  |  |  |
Unsecured Debt | Convertible Senior Notes Due 2022 [Member] | Level 1 |  |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |  |
Long-term debt-current and long-term | [1] |  |  | $ 0 |  |  |
Unsecured Debt | Convertible Senior Notes Due 2022 [Member] | Level 2 |  |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |  |
Long-term debt-current and long-term | [1] |  |  | 344,353 |  |  |
Unsecured Debt | Convertible Senior Notes Due 2022 [Member] | Level 3 |  |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |  |
Long-term debt-current and long-term | [1] |  |  | 0 |  |  |
Unsecured Debt | Notes | Level 1 |  |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |  |
Long-term debt-current and long-term | [2] |  |  | 0 |  |  |
Unsecured Debt | Notes | Level 2 |  |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |  |
Long-term debt-current and long-term | [2] |  |  | 586 |  |  |
Unsecured Debt | Notes | Level 3 |  |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |  |
Long-term debt-current and long-term | [2] |  |  | 0 |  |  |
Unsecured Debt | Carrying Value | Convertible Senior Notes Due 2022 [Member] |  |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |  |
Long-term debt-current and long-term | [1] |  |  | 290,592 |  |  |
Unsecured Debt | Carrying Value | Notes |  |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |  |
Long-term debt-current and long-term | [2] |  |  | 338 |  |  |
Long-term: |  |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |  |
Cost |  |  |  | 25,882 |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  |  |  | 5 |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  |  | (16) |  |  |
Long-term: | Level 2 |  |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |  |
Cost |  |  |  |  | 60,266 |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  |  |  |  | 0 |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  |  |  | (219) |  |
Available-for-sale Securities |  |  |  | 25,871 | 60,047 |  |
Long-term: | Asset-backed Securities |  |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |  |
Cost |  |  |  | 9,383 | 23,836 |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  |  |  | 5 | 0 |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  |  | 0 | (79) |  |
Long-term: | Asset-backed Securities | Level 2 |  |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |  |
Available-for-sale Securities |  |  |  | 9,388 | 23,757 |  |
Long-term: | Corporate bonds |  |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |  |
Cost |  |  |  | 16,499 |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  |  |  | 0 |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  |  | (16) |  |  |
Long-term: | Corporate bonds | Level 2 |  |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |  |
Cost |  |  |  |  | 36,430 |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  |  |  |  | 0 |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  |  |  | (140) |  |
Available-for-sale Securities |  |  |  | $ 16,483 | $ 36,290 |  |
[1] | The closing price of the Company’s common stock was $43.02 per share at December 31, 2018 compared to a conversion price of $66.89 per share. Currently, the conversion price is above the stock price. The maximum conversion premium that can be due on the 2022 Notes is approximately 5.2 million shares of the Company’s common stock, which assumes no increases in the conversion rate for certain corporate events.
[2] | The closing price of the Company’s common stock was $43.02 per share at December 31, 2018 compared to a conversion price of $24.82 per share which, if converted, would have resulted in an approximate conversion premium of fewer than 10,000 shares of the Company’s common stock or $0.2 million of cash. The maximum conversion premium that can be due on the 2019 Notes is approximately 10,000 shares of the Company’s common stock, which assumes no increases in the conversion rate for certain corporate events.

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